This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X85SCA, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI125 Standard Cylinder SI125X85SCA
The AirTAC SI125 Standard Cylinder SI125X85SCA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 85mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X85SCA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X85SCA
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI125 Standard Cylinder SI125X85SCA
The AirTAC SI125X85SCA is a discontinued double-acting ISO 15552 profile cylinder with an 85 mm stroke and CA clevis mount. It delivers 6136 N push and 5734 N pull at 0.5 MPa via a G1/2 port. The direct is the SAI125X85SCA, retaining the exact bore, stroke, force, port and ISO 15552 mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B switches. For high heat, Viton H seals raise the limit to 150 C.
Airtac SI125 Standard Cylinder SI125X85SCA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X85SCA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X85SCA |
| Bore size | Ø125 mm |
| Stroke | 85 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI125X85SCA carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAI125X85SCA produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125X85SCA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×85 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI125 Standard Cylinder SI125X85SCA Is Used
Heavy Stamping Press
Drives robust tooling in automated metal forming, utilizing the 6136 N push force to actuate heavy dies and form components reliably.
Large Component Clamp
Secures bulky workpieces during machining via the CA clevis mount, absorbing side loads while holding parts firmly for processing.
Replacing the Airtac SI125 Standard Cylinder SI125X85SCA with the SAI125X85SCA
To replace the SI125X85SCA, order the SAI125X85SCA. Confirm the ISO 15552 CA clevis mount, 85 mm stroke, G1/2 port (PT/G/NPT thread) and the -S magnet for current AirTAC switches. Sizing both ways: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. The Ø32 mm rod uses an M27x2 thread. This plain cylinder does not hold load without live air; the 40 mm cushions only decelerate. For holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve (bores 32-100).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X85SCA
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125X85SCA FAQ
Yes, the AirTAC SI125X85SCA is discontinued. The direct replacement is the SAI125X85SCA. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 85 mm stroke, CA clevis mount, G1/2 port and 6136 N output force.
The 125 mm bore provides 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s. The G1/2 port and M27x2 rod thread are fixed by the bore.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X85SCA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X85SCA replacement — usually within 7-8 hours.